Tests of the General Electric T700 engine, which will power the UTTAS, indicated that horsepower output did not meet specifications. Wind tunnel testing, computer simulation Of aircraft handling qualities, and building of the static test model, ground test vehicle, and flyable prototypes had begun. By the close of the fiscal year the contractors had completed design layouts, released detailed drawings, and subcontracted for long, lead time hardware. Replacement of all five modules takes only about an hour and a half.Īirframe development contracts for the Utility Tactical Transport Aircraft System (UTTAS) were awarded to Boeing Vertol and Sikorsky Aircraft in August 1972. Since the engine is composed of only five separate modules, once it is out of the aircraft, the faulty module can be replaced and the engine reinstalled. During the YAH-64 flight test program, two men demonstrated that they could remove an engine in only 25 minutes. The engine itself can be easily removed from the aircraft. It requires about 15 minutes to replace any of the two dozen flightline replaceable accessories, and all field maintenance can be done using only ten standard tools found in any mechanic's toolbox. The T700 engine provides for greater ease of maintenance. The self-sealing fuel tanks can survive a hit from a 23-mm HEI round. Thus, if the fuel line is severed, fuel is not pumped into the air creating a fire hazard instead the fuel lines are sucked dry. ![]() ![]() The T700 engine uses suction type fuel delivery rather than fuel pumps at the fuel tanks. The widely separated engines on both choppers reduce- the chance that both engines are knocked out. The twin engines of the UH-60A and AH-64 provide good single engine performance, which means that the craft can get home even if it loses one engine. The T700 engine, while producing 10 percent more horsepower than the engines used in the Huey and AH-1S Cobra-TOW, is 40 percent lighter, weighing slightly over 400 pounds. In all these applications two engines are installed to give an additional margin of safety and ability to complete a mission. The T700 uses 20 to 30 percent less fuel than its predecessors. With the T700 engine, even this deficiency has been overcome. However, because of the relatively small size of the engines used in helicopters, turbine-powered machines have suffered somewhat when it comes to fuel economy. The gas turbine has been found to be the most effective power plant for military helicopters from a weight, reliability, and maintainability standpoint. Approximately 70 percent of the T700 workload is performed in the depot 30 percent is done on contract. Both engines are manufactured by General Electric. It is similar to the CT7 commercial engine that powers the Bell 214ST and Saab 340 aircraft used in commercial aviation. The 1500 horsepower T700 engine, which powers the the AH-64 Apache, Black Hawk, Seahawk, and Pavehawk H-60 helicopters, is organically repaired by the Army at the Corpus Christi Army Depot. It is a stable platform that has stable data in multiple formats. It is used in the AH-1Z (H1 Helicopter upgrade) with two T700-GE-410 engines and the UH-1Y (H-1 Helicopter Upgrade) with two T700-GE-401C engines. ![]() It provides power to the AH-64, UH-60, AH-1Z and UH-1Y. T700 is one of the most prevalent engines in the DOD.
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